Atoms, Elements, Molecules, and compounds

Question 1

Atom

Answer 1

the smallest particle of an element that can exist.

Question 2

Element

Answer 2

a pure chemical substance that cannot be physically split into a more simple substance. Each is made of one type of atom. Carbon mercury and hydrogen are examples.

Question 3

Molecule

Answer 3

the smallest particle of a substance that can exist. It is composed of two or more atoms.

Question 4

compound

Answer 4

A substance made of atoms from two or more elements.

Question 5

proton

Answer 5

A particle of matter that has positive electrical charge and found in the nucleus of an atom.

Question 6

Neutron

Answer 6

a particle of matter that has no electrical charge and found in the nucleus of a atom.

Question 7

Electron

Answer 7

A particle of matter that has a negative electrical charge and nucleus of an atom.

Question 8

Atomic Number

Answer 8

the number of protons in an elements atoms top number in the element box.

Question 9

mass number

Answer 9

Number of protons plus neutrons Bottom number in the element box.

Question 10

Chemical symbol

Answer 10

A one or two letter representation of an element.

Question 11

Subscript

Answer 11

Tiny number to the right element symbol. Tells you haw many atoms of that element.